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The title compound, C7H8NO2+·Br−·H2O, is isomorphous with 2-carboxyanilinium chloride monohydrate and contains an intramolecular N—H...O hydrogen bond, forming an S(6) motif. The main intermolecular interactions are of the N—H...O/Br and O—H...O/Br types. Hydrogen-bonding dimers are formed via the carboxyl groups and the uncoordinated water molecule, with centrosymmetric R44(12) ring motifs, in tandem with centrosymmetric R84(16) ring motifs formed by the cations and bromide anions. The hydrogen-bonded ring motifs intersect, forming chains with graph-set motif C43(10) extending along the a axis. These form a two-dimensional hydrogen-bonded network in (101) which is extended along [010] through N—H...Br hydrogen bonds. Hydrophilic layers are generated at z = 0 and 1/2 which are sandwiched between alternate hydrophobic layers across z = 1/4 and 3/4.